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https://issues.apache.org/jira/browse/DRILL-4919?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15780625#comment-15780625
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Arina Ielchiieva commented on DRILL-4919:
-----------------------------------------
This problem existed before. After DRILL-3474 introduced implicit columns,
count(1) on csv with header started to work (non-intentionally). But DRILL-3474
introduced the bug connected with json query performance DRILL-4852. After that
bug fix count(1) on csv with header stopped to work as before.
> select count(1) on csv with header no longer works
> --------------------------------------------------
>
> Key: DRILL-4919
> URL: https://issues.apache.org/jira/browse/DRILL-4919
> Project: Apache Drill
> Issue Type: Bug
> Components: Functions - Drill
> Affects Versions: 1.8.0
> Reporter: F Méthot
> Assignee: Arina Ielchiieva
> Priority: Minor
> Fix For: Future
>
>
> This happens since 1.8
> Dataset (I used extended char for display purpose) test.csvh:
> a,b,c,d\n
> 1,2,3,4\n
> 5,6,7,8\n
> Storage config:
> "csvh": {
> "type": "text",
> "extensions" : [
> "csvh"
> ],
> "extractHeader": true,
> "delimiter": ","
> }
> select count(1) from dfs.`test.csvh`
> Error: UNSUPPORTED_OPERATION ERROR: With extractHeader enabled, only header
> names are supported
> coumn name columns
> column index
> Fragment 0:0
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